The GA0 distribution model in edge-preserving parameter estimation of SAR images
The multiplicative model has been widely used to explain the statistical properties of SAR images. In it, the model for the image Z is a 2-D random field, that is regarded as the result of the product of X, the backscatter that depends on the physical characteristics of the sensed area, and Y, the s...
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1998
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0277786X_v3457_n_p209_JacoboBerlles http://hdl.handle.net/20.500.12110/paper_0277786X_v3457_n_p209_JacoboBerlles |
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| Sumario: | The multiplicative model has been widely used to explain the statistical properties of SAR images. In it, the model for the image Z is a 2-D random field, that is regarded as the result of the product of X, the backscatter that depends on the physical characteristics of the sensed area, and Y, the speckle that depends on the number of looks used to generate the image Z. The most famous distribution for SAR images based on the multiplicative model is the K distribution (Jackeman et al). Recently Frery et al. proposed an alternative distribution, The GA 0 (α, γ, n) distribution which models very well extremely heterogeneous areas (cities) as well as moderately heterogeneous areas (forest) and homogeneous areas (crop fields). The ground truth at each pixel can be characterized by the statistical parameters α and γ, while n is constant for all of the pixels. The purpose of estimating these parameters for every pixel is twofold: first, it can be used to perform a segmentation process and, second, it can be used for gray level restoration. In this work we follow a Markov random field approach and propose an energy function derived from the statistical model adopted: GA 0 (α, γ, n). Egde-preservation is taken into account implicitly in the energy function. |
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